Novel Nonlinear Model for Rapid Waveform-based Extraction Enabling Accurate High Power PA Design

This paper presents a new large signal modeling technique that makes substantial extension to the polyharmonic distortion (PHD) model concept. The extension accounts for the influence of traveling wave a₂ magnitude presented on the output port on the variation of S and T parameters. The inherent relationship between a₂ and the S and T parameters has been illustrated theoretically and experimentally. Automated extraction procedure for the extended PHD model is developed which directly utilizes large-signal waveform data. The resulting model was implemented in ADS showing very good agreement with measurement data on a 100 W LDMOS device.